Launched in 1988, Common Knowledge works with corporate clients and market research firms.
It has one of the longest trading records among US programming and online panel providers and brings to Toluna a US panel consisting of more that 500,000 members.
ToLuna operates panels in 30 countries across Europe, North and South America and Asia, with a total of more than 2.4m members.
Steve Lavine, president of Common Knowledge, said: "It has been our goal for many years to provide our North American clients with reliable global online sample and delivery service.
"Joining forces with Toluna puts quality leading sample services in the USA and Europe into one group capable of delivering on the global research needs of our clients with representative sample and reliable data delivery".